New words：

bacteria [bækˈtɪriə] n. 细菌（复数）
bacterium [bækˈtɪriəm] n. 细菌（单数）

Sample Sentences：

All bacteria are larger than viruses.
The bacteria are harmless to humans.
Soap destroys the cell walls of bacteria.

virus [ˈvaɪrəs] n. 病毒

New words：

thus [ðʌs] adv. 因此；于是；所以；这样；如此

Sample Sentences：

He studied hard, thus he passed the exam.
The team worked well together, thus winning the game.

Hold the pen thus, and you’ll write better.
The problem can be solved thus, as I showed you.

New words：

global [ˈɡləʊbl] adj. 全球的；全球性的；全世界的

Sample Sentences：

Global travel became easier with planes.
Global warming is a big problem for everyone.
The event attracted global attention last year.

New words：

evolution [ˌiːvəˈluːʃn] n. 演变；进化；发展；渐进

Sample Sentences：

The evolution of basketball rules makes the game safer.
The teacher drew a timeline of the computer’s evolution.
The evolution of humans from apes took millions of years.

New words：

evolve [ɪˈvɒlv] v. 进化；演化；逐步发展

Sample Sentences：

Fish evolved gills to breathe underwater.
She evolved her painting skills through practice.
Birds evolved from dinosaurs millions of years ago.
The company evolved from a small shop to a global brand.

global [ˈɡləʊbl] adj. 全球的；全球性的；全世界的

evolution [ˌiːvəˈluːʃn] n. 演变；进化；发展；渐进